US3491624A - Tool depth control device - Google Patents

Tool depth control device Download PDF

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Publication number
US3491624A
US3491624A US692782A US3491624DA US3491624A US 3491624 A US3491624 A US 3491624A US 692782 A US692782 A US 692782A US 3491624D A US3491624D A US 3491624DA US 3491624 A US3491624 A US 3491624A
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US
United States
Prior art keywords
tool
spindle
flag
abutment
headstock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US692782A
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English (en)
Inventor
Rene Poincenot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ratier Forest SA
Original Assignee
Ratier Forest SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ratier Forest SA filed Critical Ratier Forest SA
Application granted granted Critical
Publication of US3491624A publication Critical patent/US3491624A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/404—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/18—Cutting by use of rotating axially moving tool with stopping upon completion of prescribed operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30784—Milling including means to adustably position cutter
    • Y10T409/307952—Linear adjustment
    • Y10T409/308008—Linear adjustment with control for adjustment means responsive to activator stimulated by condition sensor
    • Y10T409/308064—Responsive to position of cutter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T483/00—Tool changing
    • Y10T483/13—Tool changing with control means energized in response to activator stimulated by condition sensor
    • Y10T483/132—Responsive to tool identifying information
    • Y10T483/134—Identifying information on tool or tool holder

Definitions

  • the invention relates to an improvement in automatic machine-tools with tool-changers and numerical control, wherein the end portion of each tool-carrier adapted to be introduced into the nose of the machine spindle is provided with an adjustable axial abutment in such a manner that it is possible to adjust the over-all length of the assembly formed by the tool-holder and the tool mounted therein to a constant value which is the same for all the tool holders of the machine, while a rod located in the bore of the machine Spindle has one end resting upon said adjustable abutment and the other end carrying a flag which is movable in front of a stationary index secured to the headstock in which the spindle is mounted, said flag and index forming together a proximity abutment device adapted to emit a signal to be transmitted to the numerical control installation of
  • the schedule of a work is effected in such a manner that the reference for the machining depths is constituted by the front end face of the machine spindle adapted to receive successive toolcarriers each fitted with a tool adapted to carry out a predetermined machining operation, such as truing a face or drilling a hole, for instance.
  • the first method consists in providing means for axially adjusting the position of the tool in its carrier so that the tool protrudes a predetermined distance beyond the front end face of the tool-carrying spindle.
  • the second method consists in providing tool length correction counters adapted to act upon the machine electronic control system which operates in response to a perforated program band.
  • both methods have drawbacks, namelyfor the first: lack of accuracy in the axial position of the tool-carrier in the spindle and requirement for an axially adjustable tool to have a sort of follow card which determines the quantity the tool is proud of its axial reference position in the spindle; for the second: necessity of adjusting each of the counters (the number of which generally corresponds to the number of the tools in the tool storage magazine) by the difference between the theoretical length of the tool and its actual length, and furthermore necessity of zero resetting the counters each time the kind of workpiece to be manufactured is being changed, i.e. each time the perforated band is being changed, and also reintroducing the corrections applied to each of the tools which are necessary for affecting the new sequence of machining operations.
  • the object of the invention is to provide an automatic machine which has not the aforesaid drawbacks of the conventional machines.
  • each toolcarrier is provided, at the end thereof adapted to be introduced into the machine spindle, with an adjustable abutment, in such a manner that it will be possible to 3,491 ,624 Patented Jan. 27, 1970 adjust the over-all length of the assembly formed by the tool-carrier and the tool mounted therein, to a constant value which is the same for all the tool carriers of the machine, while one end of a rod which is arranged in the bore of the tool-carrying spindle rests against the aforesaid adjustable abutment and the other end of said rod carries a flag which travels in front of an outer reference index carried by the headstock in which the spindle is mounted, said flag and index forming an assembly which is called proximity abutment adapted to transmit a signal each time the flag passes exactly in register with the index, said signal being conducted to the installation for the numerical control of the machine.
  • the invention will be better understood upon reading the following description supported by the accompanying drawing the only figure of which shows, partially in section, one embodiment of spindle and tool carrier arrangement in an automatic machine according to the invention.
  • the machine of which the tool-carrynig headstock is only partially shown as at 1 in the drawing, is a vertical milling machine.
  • the rotary tool-carrying spindle 2 is slidably mounted in a rotary sleeve 3 arranged in the headstock in any suitable conventional manner, for instance by means of antifriction bearings 4 and it is rotatably driven by conventional means (not shown).
  • Each tool for example a milling cutter, or as shown a drill 7, is secured in one end of a tool-carrier designated as a whole as at 8 and having a shank, for instance a taper shank 9 set into a corresponding conical bore 11 in the spindle nose and maintaining pressed against it by any suitable means shown in the example as a screwthreaded sleeve 13.
  • This sleeve is adapted to rotate in a bore 14 of the tool-carrying spindle 2 and it bears against a shoulder 15 of said spindle.
  • the inner end of the tool-holder 8 is provided with an adjustable axial abutment constituted, in this example, by the head of a bolt 21 which is engaged in an axial screw-threaded hole of said end of the tool-carrier and provided with a safety nut 22.
  • a rod 25 Arranged in the bore of the spindle 2 is a rod 25 which in this example is a cylindrical steel rod the lower end of which rests upon the head of the adjustable abutment bolt 21 of the tool-holder.
  • the other end of the rod 25 carries a flag 26 constituted, for instance, by a collar formed on said end of the rod outside the headstock 1, that is to say above said headstock in this example.
  • the set formed by the flag 26 and the stationary outer index 28 forms a so-called proximity abutment system, i.e. these two member are so designed and arranged that each time the flag passes exactly in register with the stationary index the latter emits a signal which is transferred to the numerical control installation designated here as a whole by 31.
  • the proximity abutment system is of any suitable conventional type, for instance magnetic or optical, and it is adapted to initiate the electronic counting of the tool-carrying spindle feeds for an arcuate level of said spindle with a precision of mm. for instance.
  • a workpiece 32 in which a hole 33 is to be drilled and the upper face 34 trued, for instance.
  • the spindle 2 When the tool is being replaced, the spindle 2 is generally in its uppermost position in which the flag 26 assumes for instance the position indicated in chain dotted lines at 26A.
  • the workpiece is given relatively to the headstock 1 a position such that upon the flag 26 being exactly in register with the stationary index 28, the end of the tool involved (in this instance the end of the drill 7) is located in a theoretical plane 36 positioned a short distance a above the upper face 34 of the workpiece, for example a few millimeters, so as to provide for a safety gap or clearance.
  • counting the spindle feeds is effected from the axial position of the spindle 2 in which the flag 26 assumes the position represented in solid lines, at 26, and exactly in register with the stationary index 28.
  • the flag 26 will move downwardly by the distance P+d from the position 26 to the position 26C.
  • the overall length of each tool-holder fitted with a tool i.e. the length from the tip of the tool to the bearing face of the adjustable abutment 21 is a constant and equal to L.
  • counting the depth feeds will always be carried out from the reference plane 36 in correspondence with the flag 26 being in register with the stationary index 28 and the program band is established taking into consideration the safety gap d which avoids the tips of the tools scratching the upper face of the workpiece in the course of the preparation for the various sequences.
  • a numerical control installation a headstock, a sleeve rotatably mounted in said headstock, a tubular tool-carrying spindle slidably mounted in said sleeve but angularly fixed relative thereto and having one end portion protruding out of said headstock, an elongated toolholder adapted to be secured in said end portion of said tool-carrying spindle and having an outer end and an inner end, a cutting tool mounted in said outer end of said tool holder, an adjustable axial abutment mounted in said inner end of said tool-holder, the over-all length of the assembly formed by said tool-holder with said abutment and said cutting tool mounted in said tool holder having a predetermined constant value, a rod freely threaded in said tubular tool-carrying spindle and having one end adapted to rest on said adjustable abutment when said tool-holder is secured in said spindle while the other end of said rod protrudes out of said headstock

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Turning (AREA)
  • Jigs For Machine Tools (AREA)
  • Gripping On Spindles (AREA)
US692782A 1967-07-13 1967-12-22 Tool depth control device Expired - Lifetime US3491624A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR114189 1967-07-13

Publications (1)

Publication Number Publication Date
US3491624A true US3491624A (en) 1970-01-27

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ID=8635060

Family Applications (1)

Application Number Title Priority Date Filing Date
US692782A Expired - Lifetime US3491624A (en) 1967-07-13 1967-12-22 Tool depth control device

Country Status (4)

Country Link
US (1) US3491624A (no)
JP (1) JPS4942114B1 (no)
DE (1) DE1652715B2 (no)
FR (1) FR1551889A (no)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595132A (en) * 1969-05-12 1971-07-27 Ralph S Thacker Depth-controlled drill presses
US3891039A (en) * 1973-05-15 1975-06-24 Atlas Copco Ab Method and device for drilling to a predetermined surface
US4069774A (en) * 1975-06-27 1978-01-24 Mo Och Domsjo Aktiebolag Digging and planting machine having plural surface detecting and signalling means
US4611383A (en) * 1983-06-08 1986-09-16 Traub Gmbh Tool holder for machine tools
US4750272A (en) * 1986-11-06 1988-06-14 Kearney & Trecker Corporation Tool measuring device employing gap width detection
US5313887A (en) * 1990-05-23 1994-05-24 J.E.M. Smoke Machine Company Pyrotechnic device
US20020148271A1 (en) * 2001-03-27 2002-10-17 Bruno Schiavi Process and apparatus for manufacturing products of defined thickness

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2211862A5 (no) * 1972-12-27 1974-07-19 Cloup Jean
DE2943508A1 (de) * 1979-10-27 1981-05-21 Robert Bosch Gmbh, 7000 Stuttgart Steuereinrichtung fuer werkzeugmaschinen
EP0132825A1 (de) * 1983-07-23 1985-02-13 Hermann Dipl.-Ing. Kastner Teilbares Werkzeug für die spanabhebende Bearbeitung
DE3331130A1 (de) * 1983-08-30 1985-03-14 Miyakawa Industry Co. Ltd., Seki, Gifu Werkzeugmaschine
DE3338307A1 (de) * 1983-10-21 1985-05-09 Tbt Tiefbohrtechnik Gmbh Und Co Kg, 7433 Dettingen Magazin fuer eine einrichtung zum werkzeugwechsel an einer ein- oder mehrspindeligen tiefbohrmaschine
DE3719167C1 (de) * 1987-06-09 1988-11-03 Klingelnberg Soehne Numerisch gesteuerte Leiterplatten-Bearbeitungsmaschine
JPH01234597A (ja) * 1988-03-14 1989-09-19 Murata Mfg Co Ltd メッキ処理装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136563A (en) * 1960-09-29 1964-06-09 Sundstrand Corp Tool supporting adapter
US3209222A (en) * 1962-09-24 1965-09-28 Hughes Aircraft Co Discrete signal electrical positioning control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136563A (en) * 1960-09-29 1964-06-09 Sundstrand Corp Tool supporting adapter
US3209222A (en) * 1962-09-24 1965-09-28 Hughes Aircraft Co Discrete signal electrical positioning control system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595132A (en) * 1969-05-12 1971-07-27 Ralph S Thacker Depth-controlled drill presses
US3891039A (en) * 1973-05-15 1975-06-24 Atlas Copco Ab Method and device for drilling to a predetermined surface
US4069774A (en) * 1975-06-27 1978-01-24 Mo Och Domsjo Aktiebolag Digging and planting machine having plural surface detecting and signalling means
US4611383A (en) * 1983-06-08 1986-09-16 Traub Gmbh Tool holder for machine tools
US4750272A (en) * 1986-11-06 1988-06-14 Kearney & Trecker Corporation Tool measuring device employing gap width detection
US5313887A (en) * 1990-05-23 1994-05-24 J.E.M. Smoke Machine Company Pyrotechnic device
US20020148271A1 (en) * 2001-03-27 2002-10-17 Bruno Schiavi Process and apparatus for manufacturing products of defined thickness

Also Published As

Publication number Publication date
DE1652715A1 (de) 1970-12-03
JPS4942114B1 (no) 1974-11-13
DE1652715B2 (de) 1971-08-05
FR1551889A (no) 1969-01-03

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